Package: munin-plugins-core
Version: 2.0.33-1
Severity: minor
Hi,
it seems that if you can't resolve hostnames when munin-node starts, the
SNMP-based plugins will be assigned to the local host name instead of the node
name one expects.
More details:
- zaphod.casa.mia: munin-node and dns server (I discovered the issue at boot
time, but you can reproduce it stopping the DNS server or removing entries
from /etc/hosts)
- c877-cs-1.casa.mia: the device we want to monitor via snmp
- /etc/munin/munin.conf stanzas:
[zaphod.casa.mia]
address 127.0.0.1
use_node_name yes
[c877-cs-1.casa.mia]
address 127.0.0.1
use_node_name no
Steps to reproduce:
1. telnet localhost 4949
1a. list zaphod.casa.mia -> check that no snmp_* entries are shown
1b. list c877-cs-1.casa.mia -> check that the usual snmp_* entries are shown
2. stop the dns and/or remove the entry from /etc/hosts
3. start munin-node
4. telnet localhost 4949
4a. list zaphod.casa.mia -> snmp_c877-cs-1.casa.mia_* appear
4b. list c877-cs-1.casa.mia -> only snmp_c877-cs-1.casa.mia_uptime is shown
(sometimes something else)
In /var/log/munin/munin-node.log is then seen (just one for clarity):
2017/10/14-12:25:33 [707] Error output from snmp_c877-cs-1.casa.mia_if_2:
2017/10/14-12:25:33 [707] Could not set up SNMP 2 session to
c877-cs-1.casa.mia: Unable to resolve the UDP/IPv4 address "c877-cs-1.casa.mia"
2017/10/14-12:25:33 [707] Service 'snmp_c877-cs-1.casa.mia_if_2' exited with
status 11/0.
/etc/munin/plugins/snmp_c877-cs-1.casa.mia_if_2 is a symlink to
/usr/share/munin/plugins/snmp__if_
Seeing the above log I'm not sure if this report should be assigned to
munin-node or
if it's something in Munin::Plugin::SNMP.
Thanks for maintaining munin,
Riccardo
-- System Information:
Debian Release: 9.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8),
LANGUAGE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages munin-plugins-core depends on:
ii munin-common 2.0.33-1
ii perl 5.24.1-3+deb9u2
Versions of packages munin-plugins-core recommends:
ii libnet-snmp-perl 6.0.1-2
Versions of packages munin-plugins-core suggests:
pn conntrack <none>
pn libcache-cache-perl <none>
pn libdbd-mysql-perl <none>
pn libnet-dns-perl <none>
pn libnet-netmask-perl <none>
pn libnet-telnet-perl <none>
pn libxml-parser-perl <none>
ii python 2.7.13-2
ii ruby 1:2.3.3
-- no debconf information
